JP2007198206A - Vehicle cooling device - Google Patents

Abstract

The present invention provides a vehicle cooling device capable of improving warm-up efficiency by cooling water and optimizing warm-up performance.
SOLUTION: A first heat circulation passage 31 for returning cooling water from an engine E as it is, a second heat circulation passage 32 for circulating cooling water to an oil cooler 21, and third heat for circulating cooling water to an ATF cooler 22. A circulation passage 33, a fourth heat circulation passage 34 for circulating the cooling water to the radiator 23, and a first bypass for circulating the cooling water from the third heat circulation passage on the downstream side of the ATF cooler to the fourth heat circulation passage on the downstream side of the radiator The most sensitive temperature provided in the passage 36, the second bypass passage 37 for circulating the cooling water from the second heat circulation passage downstream of the oil cooler to the third heat circulation passage downstream of the ATF cooler, and the third connecting portion 43 The third thermostat S3 having a low temperature and the second connecting portion 42 are provided at the second thermostat S2 having a higher sensitivity temperature than the third thermostat S3 and the first connecting portion 41, and the sensing temperature is higher than the second thermostat S2. 1st high And a thermostat S1.
[Selection] Figure 1

Description

  The present invention relates to a cooling apparatus for a vehicle including a plurality of heat exchangers, and in particular, heat exchange with cooling water is performed in order from a heat exchanger having a higher warm-up priority order to optimize warm-up performance. It is related to measures.

Conventionally, a plurality of heat circulation passages for circulating cooling water from the engine to a radiator, an ATF (automatic transmission fluid) cooler, and the like, and a radiator or an ATF cooler via these heat circulation passages from the engine A thermostat that switches the circulation of the cooling water. With this thermostat, when the engine is cold, the cooling water from the engine is circulated only to the ATF cooler without being circulated to the radiator. What was made to perform is conventionally known (for example, refer patent document 1). In this case, the ATF cooler and the oil cooler are connected in series to the heat circulation passage, and the cooling water from the engine is circulated to the ATF cooler and the oil cooler when the engine is cold, so that both the ATF cooler and the oil cooler are early. It is also done to warm up.
Japanese Patent Laid-Open No. 2005-220828

  However, when the ATF cooler and the oil cooler are connected in series to the heat circulation passage, a thermostat for switching a plurality of heat circulation passages for circulating cooling water from the engine to the ATF cooler, the oil cooler, and the radiator. The operating temperature (sensitive temperature) of the heat circulation path switching means is very difficult to set.

  In other words, in a plurality of heat exchangers such as ATF coolers and oil coolers that have different warm-up priorities required by heat exchange with cooling water when cold, the time until the warm-up priorities are reached respectively. Will be different. Therefore, when the operating temperature of the heat circulation passage switching means is set in accordance with a heat exchanger (for example, oil cooler) having a high warm-up priority, the warm-up temperature is set for a heat exchanger (for example, ATF cooler) having a low warm-up priority. Cooling water is circulated and cooled to a heat exchanger such as a radiator in a state where the warm-up is insufficient and the warm-up is insufficient, and the warm-up efficiency due to the cooling water deteriorates and the warm-up performance is optimized. I can't plan.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle cooling device that can improve warm-up efficiency by cooling water and optimize warm-up performance. It is in.

  In order to achieve the above object, according to the present invention, as a vehicle cooling device, a plurality of heat exchangers having different warm-up priorities required by heat exchange with cooling water when cold are used, and these heat exchangers. A plurality of heat circulation passages for circulating cooling water and a plurality of or single heat circulation passage switching means for switching the circulation of the cooling water to each heat exchanger via these heat circulation passages are provided. Then, the circulation path of the cooling water with respect to the heat circulation passage is switched by the heat circulation passage switching means so that the cooling water is circulated in order from the heat exchanger having the highest warm-up priority.

  Because of this specific matter, the circulation path of the cooling water with respect to the heat circulation passage is switched by the heat circulation passage switching means so that the cooling water is circulated in order from the heat exchanger having the highest warm-up priority order. The heat circulation passage for circulating the cooling water to the lower rank heat exchanger is switched, and the plurality of heat exchangers are sequentially warmed to a desired temperature. For this reason, heat exchange with low warm-up priority, such as multiple heat exchangers connected in series to the heat circulation passage, which have different warm-up priorities required by heat exchange with cooling water when cold It is avoided that the cooling water is circulated through a heat exchanger such as a radiator when the warming-up temperature of the heater is less than the desired temperature and the warming-up is insufficient. Thus, it is possible to optimize the warm-up performance.

  In particular, the following configurations are listed as specifying a plurality of heat exchangers, a plurality of heat circulation passages, and a heat circulation passage switching means.

  In short, as the plurality of heat exchangers, the first heat exchanger with the highest warm-up priority, the second heat exchanger with the warm-up priority lower than the first heat exchanger, and the second heat exchange And a third heat exchanger having a lower warm-up priority than the heat exchanger, and the plurality of heat circulation passages circulate so that the cooling water discharged from the water pump is returned to the water pump through the engine A first heat circulation passage to be connected, a second heat circulation passage connected in parallel to the first heat circulation passage to circulate cooling water from the engine to the first heat exchanger, and the second heat circulation passage. Connected in parallel to the third heat circulation passage for circulating cooling water from the engine to the second heat exchanger, and connected in parallel to the third heat circulation passage, the cooling water from the engine 4th circulating to the 3rd heat exchanger A first connection portion connecting the circulation passage, the fourth heat circulation passage on the downstream side of the third heat exchanger, and the third circulation passage on the downstream side of the second heat exchanger; and the upstream of the first connection portion The third heat circulation passage connected between the fourth heat circulation passage located on the side and the third heat circulation passage located downstream of the second heat exchanger and upstream of the first connection portion. A first bypass passage that allows only cooling water to be circulated from the side to the fourth heat circulation passage side, the fourth heat circulation passage on the downstream side of the third heat exchanger, and the downstream side of the second heat exchanger A second connection portion that connects the third heat circulation passage to the second heat circulation passage downstream of the first heat exchanger, and the third heat circulation passage located upstream of the first connection portion. Connected to the second heat circulation passage located downstream of the first heat exchanger and upstream of the second connecting portion, A second bypass passage that allows only cooling water to circulate from the second heat circulation passage side to the third heat circulation passage side, the fourth heat circulation passage on the downstream side of the third heat circulation passage, and the second A third connection portion that connects the third heat circulation passage on the downstream side of the heat exchanger, the second heat circulation passage on the downstream side of the first heat exchanger, and the first heat circulation passage is applied. The heat circulation passage switching means is provided in the first to third connection portions, and the heats are circulated in the order of the first heat exchanger, the second heat exchanger, and the third heat exchanger. The cooling water circulation with respect to the circulation passage is switched by the heat circulation passage switching means.

  Due to this specific matter, the cooling water circulating through the first heat circulation passage so as to return from the water pump to the water pump through the engine is changed to the highest warm-up priority by switching the heat circulation passage switching means of the third connection portion. It circulates through the 2nd heat circulation passage with respect to 1 heat exchanger. When the first heat exchanger is warmed up to a desired temperature, the heat circulation passage switching means of the second connection part is switched to the second heat exchanger having a lower warm-up priority than the first heat exchanger. The cooling water circulates through the third heat circulation passage, and the cooling water circulated through the second heat circulation passage from the second bypass passage to the first heat exchanger downstream of the second heat exchanger. It circulates through 3 heat circulation passages. Then, when the second heat exchanger is warmed up to a desired temperature, the heat circulation passage switching means of the first connection portion is switched to the third heat exchanger having a lower warm-up priority than the second heat exchanger. On the other hand, the cooling water circulates through the fourth heat circulation passage, and the cooling water circulated through the second and third heat circulation passages to the first and second heat exchangers passes through the first and second bypasses. It circulates from a passage via the 4th heat circulation passage.

  As a result, the heat circulation passage for circulating the cooling water is sequentially switched for the heat exchangers with higher priority for warming up, and the first heat exchanger, the second heat exchanger, and the third heat exchanger are desired in this order. It will be warmed up to each temperature. For this reason, the cooling water may be circulated to a heat exchanger such as a radiator in a state where the warm-up temperature of the third heat exchanger having a low warm-up priority level does not reach a desired temperature and the warm-up is insufficient. Thus, the warm-up efficiency by the cooling water is improved, and the warm-up performance can be optimized.

  Further, as the heat circulation passage switching means, a plurality of thermostats having different sensitive temperatures are applied, and the heat circulation is performed so that each of the thermostats circulates the cooling water in order from the heat exchanger having the highest warm-up priority. When it is arranged at the connection part between the passages, the heat circulation passage for circulating the cooling water to the heat exchanger with the highest priority for warming up is switched in order according to the thermostat's sensitive temperature. The heat exchangers are each warmed up to a desired temperature in the order of heat exchangers with higher ranks. For this reason, it is avoided that the cooling water is circulated to the heat exchanger such as the radiator in a state where the warming-up temperature of the heat exchanger having a low warming-up priority level does not reach the desired temperature and the warming up is insufficient. As a result, the warm-up efficiency by the cooling water becomes good and the warm-up performance can be optimized. In addition, since each thermostat is sequentially switched according to the sensitive temperature, it is not necessary to provide a means for switching each heat circulation passage from the outside, and it is possible to construct an inexpensive and highly reliable circulation route.

  On the other hand, a plurality of cooling water inlets individually connected to the respective heat circulation passages, a single cooling water outlet port, and cooling that circulates through the heat circulation passages in the heat circulation passage switching means. A piston having a different amount of forward / backward movement according to the temperature of the water is provided, and at least one of the cooling water inlet and the cooling water outlet is communicated by the piston moving forward / backward according to the temperature of the cooling water. When the heat circulation passage switching means is configured to circulate the cooling water in order from the heat exchanger with the higher priority of the machine, the cooling water is supplied to the heat exchanger with the higher priority of the warm-up. The heat circulation passage to be circulated is switched in order by connecting at least one cooling water inlet and the cooling water outlet through pistons with different amounts of advance and retreat depending on the temperature of the cooling water, and heat with a high warm-up priority. Exchanger Each will be warmed up to the desired temperature in the order. For this reason, it is avoided that the cooling water is circulated to the heat exchanger such as the radiator in a state where the warming-up temperature of the heat exchanger having a low warming-up priority level does not reach the desired temperature and the warming up is insufficient. As a result, the warm-up efficiency by the cooling water becomes good and the warm-up performance can be optimized. In addition, each thermal circulation passage is switched by a single thermal circulation passage switching means, so that switching of each thermal circulation passage according to the temperature of the cooling water can be performed using thermal circulation passage switching means such as a plurality of thermostats. There is no need to perform this, and the number of parts constituting the cooling device can be reduced.

  In short, by switching the cooling water circulation path with respect to the heat circulation passage by the heat circulation passage switching means so that the cooling water is circulated in order from the heat exchanger having the highest warm-up priority, the warm-up priority is high. Switch the heat circulation path that circulates the cooling water to the heat exchangers in the order to warm up the multiple heat exchangers to the desired temperature in order, and eliminate the lack of warm-up of heat exchangers with low warm-up priority. It is possible to optimize the warm-up performance by improving the warm-up efficiency with water.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a circuit diagram schematically showing a cooling water circulation path of a cooling device for a vehicle. The cooling device 1 has a plurality of different warm-up priorities required for heat exchange with cooling water when cold. It has a heat exchanger. As each of these heat exchangers, an oil cooler 21 as a first heat exchanger with the lowest warm-up priority, and an ATF (automatic-heater) as a second heat exchanger with a higher warm-up priority than the oil cooler 21 are used. A transmission fluid) cooler 22 and a radiator 23 as a third heat exchanger having a higher warm-up priority than the ATF cooler 22 are applied.

  The cooling device 1 includes a plurality of heat circulation passages for circulating cooling water to the oil cooler 21, the ATF cooler 22, and the radiator 23. The plurality of heat circulation passages include a first heat circulation passage 31 that circulates cooling water discharged from the water pump 11 so as to return to the water pump 11 through the engine E, a downstream side of the engine E, and the water pump 11. A second thermal circulation passage 32 connected in parallel to the first thermal circulation passage 31 positioned between the upstream side and the cooling water from the engine E to the oil cooler 21, and an upstream side of the oil cooler 21; A third heat circulation passage 33 that is connected in parallel to the second heat circulation passage 32 positioned between the ATF cooler 22 and the second heat circulation passage 32, and upstream of the ATF cooler 22. A fourth thermal circulation passage 34 connected in parallel to the third thermal circulation passage 33 located between the side and the downstream side and circulating the cooling water from the engine E to the radiator 23; The fourth thermal circulation passage 34 located on the upstream side of the first connection portion 41 with the third heat circulation passage 33 on the downstream side of the radiator 23 and the downstream side of the ATF cooler 22 and the first connection portion 41. Is connected to the third heat circulation passage 33 located on the upstream side, and allows only the circulation of the cooling water from the third heat circulation passage 33 side to the fourth heat circulation passage 34 side. 12, a third heat circulation passage 33 positioned downstream of the ATF cooler 22 and upstream of the first connection portion 41, and downstream of the oil cooler 21. It is connected between the second heat circulation passage 32 located upstream of the second connection portion 42 with the third heat circulation passage 33, and from the second heat circulation passage 32 side to the third heat circulation passage 33 side. A second check valve 13 is provided to allow only cooling water to circulate. The upstream end of the heater 24 is connected to the second bypass passage 37 and the fourth heat circulation passage 34 located on the upstream side of the radiator 23, while the downstream end of the heater 24 is downstream of the second connection portion 42. A heater 24 that is connected to the first heat circulation passage 31 located downstream of the third connection portion 43 with the second heat circulation passage 32 on the side and is heated by cooling water from the engine E is interposed. The fifth heat circulation passage 35 is applied to each.

  The cooling device 1 circulates the cooling water to the oil cooler 21, the ATF cooler 22, and the radiator 23 through the first to fourth heat circulation passages 31 to 34 and the first and second bypass passages 36 and 37. A plurality of heat circulation passage switching means for switching are provided. As each heat circulation passage switching means, the first thermostat S1 provided in the first connection portion 41, the second thermostat S2 provided in the second connection portion 42, and the third connection portion 43 are provided. Each of the third thermostats S3 is applied. Each of the thermostats S1 to S3 circulates through the heat circulation so that the cooling water is circulated in the order of the oil cooler 21, the ATF cooler 22 and the radiator 23 having the highest warm-up priority among the oil cooler 21, the ATF cooler 22 and the radiator 23. The sensitive temperatures are set different from each other so that the circulation path of the cooling water for the passages 31 to 34 and the bypass passages 36 and 37 can be switched. That is, the third thermostat S3 is set to the lowest sensitive temperature, the second thermostat S2 is set to a higher sensitive temperature than the third thermostat S3, and the first thermostat S1 is set to a higher sensitive temperature than the second thermostat S2. In this case, as shown in FIG. 2, the thermostats S <b> 1 to S <b> 3 are set to different sensitive temperatures, so that there is a difference in switching timing depending on the time required for the temperature rise of the cooling water. The thermostat S3 is switched when the temperature of the cooling water rises and the time t1 elapses and reaches the first sensitive temperature c1, and the second thermostat S2 is switched on after the time t2 elapses after the temperature of the cooling water rises. The first thermostat S1 is switched when the temperature reaches the second sensitive temperature c2, and the first thermostat S1 is switched when the temperature of the cooling water rises and the time t3 elapses and reaches the third sensitive temperature c3.

  Here, the circulation path of the cooling water when the thermostats S1 to S3 are switched in the order of different sensitive temperatures will be described with reference to FIGS.

  First, when the engine E is cold-started, the third thermostat S3 is switched to the communication position (the upper position shown in FIG. 1) communicating with the first heat circulation passage 31 on the downstream side of the engine E. The cooling water is circulated so as to be returned to the water pump 11 through the first heat circulation passage 31 to warm up the engine E. At this time, the cooling water from the engine E is also led to the heater 24 through the fifth heat circulation passage 35 and circulates so as to heat the heater 24 by the cooling water from the engine E.

  When the time t1 has elapsed after the cold start of the engine E and the temperature of the cooling water reaches the first sensitive temperature c1, the third thermostat S3 performs the first heat on the downstream side of the engine E as shown in FIG. The communication position communicating with the circulation passage 31 is switched to the communication position communicating with the downstream end of the second thermal circulation passage 32 (the lower position shown in FIG. 3), and the coolant from the engine E is guided to the oil cooler 21 to engine oil. The coolant is circulated to return to the water pump 11 via the second thermostat S2 in the communication position (upper position shown in FIG. 3) communicating with the downstream end of the second heat circulation passage 32, and the oil is circulated. The cooler 21 is warmed up. At this time, the cooling water from the engine E is continuously led to the heater 24 through the fifth heat circulation passage 35 and circulates so as to heat the heater 24 with the cooling water from the engine E.

  Thereafter, when the time t2 has elapsed since the cold start of the engine E and the temperature of the cooling water reaches the second sensitive temperature c2, the second thermostat S2 enters the second heat circulation passage 32 as shown in FIG. The communication position (upper position shown in FIG. 3) communicating with the downstream end is switched to the communication position (lower position shown in FIG. 4) communicating with the downstream end of the third heat circulation passage 33, and the cooling water from the engine E is converted to ATF. The air is guided to the cooler 22 to exchange heat with the ATF, and the coolant that has been led from the engine E to the oil cooler 21 and exchanged heat with the engine oil is led to the third heat circulation passage 33 through the second bypass passage 37, Cooling is performed so that the first thermostat S1 at the communication position (upper position shown in FIG. 4) communicating with the downstream end of the three heat circulation passages 33 is returned to the water pump 11 via the second and third thermostats S2 and S3. By circulating water to warm up the ATF cooler 22 and the oil cooler 21. Also at this time, the cooling water from the engine E is continuously guided to the heater 24 via the fifth heat circulation passage 35 and circulates so that the heater 24 is heated by the cooling water from the engine E. ing.

  Thereafter, when the time t3 elapses after the cold start of the engine E and the temperature of the cooling water reaches the third sensitive temperature c3, the first thermostat S1 moves downstream of the third heat circulation passage 33 as shown in FIG. The communication position (upper position shown in FIG. 4) communicating with the end is switched to the communication position (lower position shown in FIG. 5) communicating with the downstream end of the fourth heat circulation passage 34, and the cooling water from the engine E is supplied to the radiator 23. Then, the cooling water is cooled by exchanging heat with the traveling wind and guided from the engine E to the oil cooler 21 and heat-exchanged with the engine oil to the third heat circulation passage 33 via the second bypass passage 37. Then, the engine E is led to the ATF cooler 22 and led to the fourth heat circulation passage 34 through the first bypass passage 36 together with the cooling water heat-exchanged with the ATF. And it returns so that it may return to the water pump 11 via 2nd and 3rd thermostat S2, S3 from 1st thermostat S1 in the communicating position (lower position shown in FIG. 5) which communicates with the downstream end of the 4th thermal circulation path 34. The cooling water is circulated to suppress the temperature rise of the ATF cooler 22 and the oil cooler 21. At this time, the cooling water from the engine E is also led to the heater 24 through the fifth heat circulation passage 35 so that the heater 24 is continuously heated by the cooling water from the engine E. It is circulating. In this case, when the temperature of the cooling water reaches the third sensitive temperature c3 after the elapse of time t3, the warm-up of the oil cooler 21 and the ATF cooler 22 is finished.

  Therefore, in the first embodiment, the coolant supplied to warm up the engine E through the first heat circulation passage 31 so as to be returned from the water pump 11 to the water pump 11 through the engine E is When the time t1 has passed since the cold start and the temperature of the cooling water reaches the first sensitive temperature c1, the third thermostat S3 of the third connecting portion 43 is switched, so that the oil cooler 21 having the highest warm-up priority is obtained. Circulates through the second heat circulation passage 32. When the time t2 elapses after the cold start of the engine E and the temperature of the cooling water reaches the second sensitive temperature c2, the oil cooler 21 is warmed up to the desired temperature c2, and the second connection portion 42 When the two thermostats S2 are switched, the coolant circulates through the third heat circulation passage 33 to the ATF cooler 22 having a lower warm-up priority than the oil cooler 21, and the second heat circulation passage to the oil cooler 21. The cooling water that has been circulated through the second circulator 32 is circulated from the second bypass passage 37 through the third heat circulation passage 33 downstream of the ATF cooler 22. Thereafter, when the temperature t3 elapses after the cold start of the engine E and the temperature of the cooling water reaches the third sensitive temperature c3, the ATF cooler 22 is warmed up to a desired temperature, and the first connection portion 41 has the first temperature. When the thermostat S1 is switched, the cooling water is circulated through the fourth heat circulation passage 34 to the radiator 23 having a lower warm-up priority than the ATF cooler 22, and the second and the second oil coolants 21 and ATF cooler 22 are second and second. The cooling water circulated through the third heat circulation passages 32, 33 passes from the first and second bypass passages 36, 37 to the third heat circulation passage 33 downstream of the ATF cooler 22 and the fourth heat circulation passage downstream of the radiator 23. Circulates through 34.

  As a result, each of the heat circulation passages 31 to 34 and each of the bypass passages 36 and 37 for circulating the cooling water to the heat exchangers (oil cooler 21, ATF cooler 22 and radiator 23) with a higher warm-up priority are provided with each thermostat. The oil cooler 21, the ATF cooler 22, and the radiator 23 are switched in order in accordance with the sensitive temperatures S <b> 1 to S <b> 3, and are warmed up to desired temperatures in this order. For this reason, it is avoided that the warm-up temperature of the ATF cooler 22 having a low warm-up priority is less than the desired temperature and the coolant is not circulated to the radiator 23 in a state where the warm-up is insufficient. The machine efficiency is improved and the warm-up performance can be optimized.

  In addition, the thermostats S1 to S3 are sequentially switched according to the sensitive temperature, so that it is not necessary to provide means for switching the heat circulation passages 31 to 34 from the outside, and an inexpensive and highly reliable circulation route is constructed. be able to.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  In the second embodiment, the configuration of the heat circulation passage switching means is changed. The rest of the configuration except for the heat circulation passage switching means is the same as that of the first embodiment, and the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

  That is, in this example, as shown in FIG. 6, each downstream end of the first to fourth thermal circulation passages 31 to 34 is connected to a thermal circulation passage switching device 5 as thermal circulation passage switching means. As shown in FIG. 7, the heat circulation passage switching device 5 includes first to fourth cooling water inlets 51 to 54 individually connected to the first to fourth heat circulation passages 31 to 34, and downstream A cylinder 50 having a single cooling water outlet 55 connected to the upstream end of the sixth thermal circulation passage 39 whose end is connected to the fifth thermal circulation passage 35 on the downstream side of the heater 24 is provided. Further, in the cylinder 50, a piston 56 that moves forward and backward in its axial direction (left and right in FIG. 7) and one side end (right end in FIG. 7) of the cylinder 50 are fixed, and the piston 56 is fixed in the axial direction. A moving device 57 for moving to the forward side (left side in FIG. 7) and an urging spring 58 for urging the piston 56 to the axially backward side (right side in FIG. 7) are provided.

  As shown in FIG. 8, the piston 56 has an introduction side communication hole 56a communicating with any one of the first to fourth cooling water introduction ports 51 to 54, and the introduction side communication hole 56a. And a lead-out side communication hole 56 b for communicating any one of the first to fourth cooling water inlets 51 to 54 with the cooling water outlet 55 through the cylinder 50. The moving device 57 has a base end connected to a cylindrical device main body 57b in which a thermo wax 57a is sealed and a piston portion 57c slidably supported in the device main body 57b. A piston rod portion 57d having a tip (left end in FIG. 7) connected to an axial retreat side end (right end in FIG. 7) so that the piston 56 moves forward and backward in the axial direction by expansion and contraction of 57a. ing. In this case, the thermowax 57a in the moving device 57 expands and contracts according to the temperature of the cooling water circulating through the first to fourth heat circulation passages 31 to 34, and varies the amount of movement of the piston 56 forward and backward. Any one of the first to fourth cooling water introduction ports 51 to 54 is connected to the introduction side communication hole 56a. The piston 56 moves in the axial direction backward side (right side in FIG. 7) in combination with the urging force of the urging spring 58 when the thermowax 57a contracts.

  In this case, the moving device 57 contracts the thermowax 57a most so that the introduction side communication hole 56a of the piston 56 communicates with the first cooling water introduction port 51 of the first heat circulation passage 31 when the engine E is cold. When the piston 56 is moved to the axially last retracted position and the engine E is started and the temperature of the cooling water reaches the first predetermined temperature (corresponding to the first sensitive temperature c1 in the first embodiment), the piston 56 is introduced. The thermowax 57a is expanded so that the side communication hole 56a communicates with the second cooling water introduction port 52 of the second heat circulation passage 32, and the piston 56 is moved forward in the axial direction. When the temperature (corresponding to the second sensitive temperature c2 of the first embodiment) is reached, the thermowax 5 is connected so that the introduction side communication hole 56a of the piston 56 communicates with the third cooling water introduction port 53 of the third heat circulation passage 33. a is expanded to further move the piston 56 forward in the axial direction, and when the temperature of the cooling water reaches a third predetermined temperature (corresponding to the third sensitive temperature c3 of the first embodiment), the introduction side communication hole of the piston 56 The thermowax 57a is further expanded so as to communicate 56a with the fourth cooling water inlet 54 of the fourth heat circulation passage 34, and the piston 56 is moved to the most advanced position in the axial direction.

  Here, the circulation path of the cooling water when the communication between the introduction side communication hole 56a of the piston 56 moving forward and backward by the moving device 57 and the first to fourth cooling water introduction ports 51 to 54 is switched will be described.

  First, when the engine E is cold-started, the thermowax 57a is most contracted to move the piston 56 to the position where the piston 56 is retracted in the axial direction. Therefore, the introduction side communication hole 56a of the piston 56 and the first heat circulation passage 31 The cooling water from the engine E is returned to the water pump 11 from the first heat circulation passage 31 through the sixth heat circulation passage 39 and the fifth heat circulation passage 35. To warm up the engine E. At this time, the cooling water from the engine E is also led to the heater 24 through the fifth heat circulation passage 35 and circulates so as to heat the heater 24 by the cooling water from the engine E.

  When the temperature of the cooling water reaches the first predetermined temperature (corresponding to the first sensitive temperature c1), the thermowax 57a expands to move the piston 56 to the forward side in the axial direction, and communication on the introduction side of the piston 56 occurs. The thermal circulation passage switching device 5 is switched so that the hole 56a communicates with the second cooling water introduction port 52 of the second thermal circulation passage 32. As a result, the cooling water used to warm up the engine E is guided to the oil cooler 21 to exchange heat with the engine oil, and the second heat circulation passage 32 to the sixth heat circulation passage 39 and the fifth heat circulation passage 35 are changed. Then, the cooling water is circulated so as to return to the water pump 11 and the oil cooler 21 is warmed up. At this time, the cooling water from the engine E is continuously guided to the heater 24 via the fifth heat circulation passage 35 and circulates so as to heat the heater 24 by the cooling water from the engine E.

  Thereafter, when the temperature of the cooling water reaches a second predetermined temperature (corresponding to the second sensitive temperature c2), the thermowax 57a further expands to move the piston 56 forward in the axial direction, as shown in FIG. In addition, the heat circulation passage switching device 5 is switched so that the introduction side communication hole 56 a of the piston 56 and the third cooling water introduction port 53 of the third heat circulation passage 33 communicate with each other. As a result, the coolant supplied to warm up the oil cooler 21 is also guided to the ATF cooler 22 to exchange heat with the ATF, and the coolant guided to the oil cooler 21 is transferred from the second bypass passage 37 to the third heat circulation. The ATF cooler 22 and the oil cooler 21 are joined to the passage 33 and circulated through the cooling water so as to return to the water pump 11 from the third heat circulation passage 33 through the sixth heat circulation passage 39 and the fifth heat circulation passage 35. Warm up. At this time, the cooling water from the engine E is continuously guided to the heater 24 via the fifth heat circulation passage 35 and circulates so as to heat the heater 24 with the cooling water from the engine E.

  Thereafter, when the temperature of the cooling water reaches a third predetermined temperature (corresponding to the third sensitive temperature c3), the thermowax 57a further expands to move the piston 56 to the most advanced position in the axial direction. The heat circulation passage switching device 5 is switched so that the introduction side communication hole 56a and the fourth cooling water introduction port 54 of the fourth heat circulation passage 34 are communicated with each other. As a result, the cooling water used for warming up the oil cooler 21 and the ATF cooler 22 is also led to the radiator 23 to be cooled by exchanging heat with the traveling wind, and is led from the engine E to the oil cooler 21 to be engine oil. The cooling water that has been exchanged with the heat and led to the third heat circulation passage 33 through the second bypass passage 37 is guided to the ATF cooler 22 from the engine E together with the cooling water that has exchanged heat with the ATF, and the first bypass passage 36. To the fourth heat circulation passage 34. The cooling water guided to the fourth heat circulation passage 34 is circulated so as to return to the water pump 11 through the sixth heat circulation passage 39 and the fifth heat circulation passage 35 together with the cooling water cooled by the radiator 23. The temperature rise of the ATF cooler 22 and the oil cooler 21 is suppressed. At this time, the cooling water from the engine E is also led to the heater 24 through the fifth heat circulation passage 35 so that the heater 24 is continuously heated by the cooling water from the engine E. It is circulating. In this case, the warm-up of the oil cooler 21 and the ATF cooler 22 is completed when the temperature of the cooling water reaches the third predetermined temperature.

  Therefore, in the second embodiment, the cooling water supplied to warm up the engine E through the first heat circulation passage 31 so as to be returned from the water pump 11 to the water pump 11 through the engine E is the cooling water. When the temperature reaches the first predetermined temperature, the heat circulation passage switching device 5 guides the oil cooler 21 having the highest warm-up priority through the second heat circulation passage 32. When the temperature of the cooling water reaches the second predetermined temperature, the heat circulation path switching device 5 switches the second heat circulation path 32 to the third heat circulation path 33, and the cooling water from the engine E is supplied to the oil cooler 21. The cooling water guided to the oil cooler 21 via the second heat circulation path 32 is supplied to the ATF cooler 22 having a lower warm-up priority than the second heat circulation path 32. 37 and the third heat circulation passage 33. Thereafter, when the temperature of the cooling water reaches the third predetermined temperature, the heat circulation path switching device 5 switches the third heat circulation path 33 to the fourth heat circulation path 34, and the cooling water from the engine E is supplied to the ATF cooler 22. The radiator 23 having a lower warm-up priority is led through the fourth thermal circulation passage 34 and circulated through the second and third thermal circulation passages 32 and 33 to the oil cooler 21 and the ATF cooler 22. The cooled cooling water is guided through the first and second bypass passages 36 and 37.

  Thereby, each heat circulation passage 31-34 which circulates cooling water with respect to the heat exchanger (oil cooler 21, ATF cooler 22, and radiator 23) with a high warm-up priority moves forward and backward according to the temperature of the cooling water. Any one of the first to fourth cooling water inlets 51 to 54 is communicated with the cooling water outlet 55 through the outlet side communication hole 56b by the piston 56 having a different amount via the inlet side communication hole 56a. As a result, the oil cooler 21, the ATF cooler 22, and the radiator 23 are switched in order and warmed up to a desired temperature. For this reason, it is avoided that the warm-up temperature of the ATF cooler 22 having a low warm-up priority is less than the desired temperature and the coolant is not circulated to the radiator 23 in a state where the warm-up is insufficient. The machine efficiency is improved and the warm-up performance can be optimized.

  In addition, the heat circulation passages 31 to 34 are switched by the single heat circulation passage switching device 5, so that each heat circulation according to the temperature of the cooling water using a heat circulation passage switching means such as a plurality of thermostats, for example. There is no need to switch the passage, and the number of parts constituting the cooling device 1 can be reduced.

  The present invention is not limited to the embodiments described above, and includes various other modifications. For example, in each of the above embodiments, the heat circulation passage switching devices 5 and 6 for switching the heat circulation passages 31 to 34 by the expansion and contraction of the first to third thermostats S1 to S3 or the thermowax 57a and 63b are configured. A heat circulation passage switching means for switching each heat circulation passage by electromagnetic or electric drive means may be configured.

  In each of the above-described embodiments, the cooling water circulation path for the heat exchanger such as the oil cooler 21, the ATF cooler 22, and the radiator 23 is switched. However, the heat exchanger is limited to these. Of course, the present invention can also be applied to a heat exchanger that cools other oils with cooling water.

It is a figure which shows typically the cooling water circulation path | route of the cooling device of the vehicle immediately after the cold start which concerns on Example 1 of this invention. It is a characteristic view which similarly shows the characteristic of the temperature with respect to the time after the cold start of cooling water, engine oil, and ATF. Similarly, it is a diagram schematically showing a cooling water circulation path when the temperature of the cooling water reaches the first sensitive temperature after the time t1 has elapsed since the cold start. Similarly, it is a diagram schematically showing a cooling water circulation path when the temperature t2 has elapsed from the cold start and the temperature of the cooling water has reached the second sensitive temperature. Similarly, it is a diagram schematically showing a cooling water circulation path when the temperature of the cooling water reaches the third sensitive temperature after the time t3 has elapsed since the cold start. It is a figure which shows typically the cooling water circulation path | route of the cooling device of the vehicle concerning Example 2 of this invention. It is a sectional view of the same heat circulation passage switching device. FIG. 6 is a perspective view of the piston in the vicinity of the backward end on the axial direction.

Explanation of symbols

1 Cooling device 11 Water pump 21 Oil cooler (first heat exchanger)
22 ATF cooler (second heat exchanger)
23 Radiator (Third heat exchanger)
31 1st thermal circulation path 32 2nd thermal circulation path 33 3rd thermal circulation path 34 4th thermal circulation path 36 1st bypass path 37 2nd bypass path 41 1st connection part 42 2nd connection part 43 3rd connection part 5 Thermal circulation passage switching device (thermal circulation passage switching means)
51 1st cooling water introduction port 52 2nd cooling water introduction port 53 3rd cooling water introduction port 54 4th cooling water introduction port 55 Cooling water outlet 56 Piston 6 Thermal circulation passage switching device (thermal circulation passage switching means)
E engine S1 first thermostat (thermal circulation passage switching means)
S2 Second thermostat (thermal circulation path switching means)
S3 Third thermostat (thermal circulation path switching means)

Claims (4)

A plurality of heat exchangers having different warm-up priorities required by heat exchange with cooling water when cold, and
A plurality of heat circulation passages for circulating cooling water to these heat exchangers;
A plurality of or single heat circulation passage switching means for switching the circulation of the cooling water to each heat exchanger via these heat circulation passages,
The vehicle is characterized in that the heat circulation passage switching means switches the cooling water circulation path with respect to the heat circulation passage so that the cooling water is circulated in order from the heat exchanger having the highest priority for warm-up. Cooling system. The vehicle cooling device according to claim 1,
As the plurality of heat exchangers,
The first heat exchanger with the highest warm-up priority,
A second heat exchanger with a lower warm-up priority than the first heat exchanger;
A third heat exchanger having a lower warm-up priority than the second heat exchanger is applied,
As the plurality of heat circulation passages,
A first thermal circulation passage for circulating cooling water discharged from the water pump so as to return to the water pump through the engine;
A second heat circulation passage connected in parallel to the first heat circulation passage and circulating the cooling water from the engine to the first heat exchanger;
A third heat circulation path connected in parallel to the second heat circulation path and circulating the cooling water from the engine to the second heat exchanger;
A fourth heat circulation passage connected in parallel to the third heat circulation passage and circulating cooling water from the engine to the third heat exchanger;
A first connection portion connecting the fourth heat circulation passage on the downstream side of the third heat exchanger and the third circulation passage on the downstream side of the second heat exchanger;
Connected between the fourth heat circulation passage located upstream of the first connection portion and the third heat circulation passage located downstream of the second heat exchanger and upstream of the first connection portion; A first bypass passage that allows only cooling water to circulate from the third heat circulation passage side to the fourth heat circulation passage side;
Connecting the fourth heat circulation passage downstream of the third heat exchanger, the third heat circulation passage downstream of the second heat exchanger, and the second heat circulation passage downstream of the first heat exchanger. A second connecting part,
Connected between the third heat circulation passage located upstream of the first connection portion and the second heat circulation passage located downstream of the first heat exchanger and upstream of the second connection portion; A second bypass passage that allows only cooling water to be circulated from the second heat circulation passage side to the third heat circulation passage side;
The fourth heat circulation passage downstream of the third heat circulation passage, the third heat circulation passage downstream of the second heat exchanger, the second heat circulation passage downstream of the first heat exchanger, and the first. And a third connecting part for connecting the heat circulation passage,
The thermal circulation passage switching means is
Cooling water is circulated to each of the heat circulation passages so as to circulate the cooling water in the order of the first heat exchanger, the second heat exchanger, and the third heat exchanger. A vehicle cooling device characterized by switching. The vehicle cooling device according to claim 1 or 2,
As the heat circulation passage switching means, a plurality of thermostats having different sensitive temperatures are applied,
Each said thermostat is arrange | positioned in the connection part of each said heat circulation path so that cooling water may be circulated in an order from the heat exchanger of a warming-up priority high order | rank, The cooling device of the vehicle characterized by the above-mentioned. The vehicle cooling device according to claim 1 or 2,
The heat circulation passage switching means has a plurality of cooling water inlets individually connected to the respective heat circulation passages, a single cooling water outlet, and a temperature of the cooling water circulating in the heat circulation passage. And a piston having a different amount of forward / backward movement, and at least one of the cooling water inlet and the cooling water outlet is connected by the piston moving forward / backward according to the temperature of the cooling water. A cooling device for a vehicle, characterized in that the cooling water is circulated in order from a heat exchanger having a higher rank.

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